In his own planet, Lord Brahmā, with the inhabitants of that planet, worships the form of Lord Govinda, Kṛṣṇa, by the mantra of eighteen syllables, klīṁ kṛṣṇāya govindāya gopī-jana-vallabhāya svāhā. Those who are initiated by a bona fide spiritual master and who chant the Gāyatrī mantra three times a day know this aṣṭādaśākṣara (eighteen-syllable) mantra. The inhabitants of Brahmaloka and the planets below Brahmaloka worship Lord Govinda by meditating with this mantra. There is no difference between meditating and chanting, but in the present age meditation is not possible on this planet. Therefore loud chanting of a mantra like the mahā-mantra, Hare Kṛṣṇa, with soft chanting of the aṣṭādaśākṣara, the mantra of eighteen syllables, is recommended.
(Sri Caitanya Caritamrta------1:5:221------purport).

Gāyantaṁ trāyate yasmād gāyatrī tvaṁ tataḥ smṛtā: one who chants the Gāyatrī mantra is gradually delivered from the material clutches. In other words, that which delivers one from material entanglement is called Gāyatrī. An explanation of the Gāyatrī mantra can be found in the Madhya-līlā, Chapter Twenty-one, text 125:
kāma-gāyatrī-mantra-rūpa, haya kṛṣṇera svarūpa,
sārdha-cabbiśa akṣara tāra haya
se akṣara "candra" haya, kṛṣṇe kari' udaya,
trijagat kailā kāmamaya
The Kāma-gāyatrī mantra is just like a Vedic hymn, but it is the Supreme Personality of Godhead Himself. There is no difference between the Kāma-gāyatrī and Kṛṣṇa.
(Sri Caitanya Caritamrta------2:8:138------purport).

Lord Kṛṣṇa is worshiped by the gāyatrī mantra, and the specific mantra by which He is worshiped is called kāma-gāyatrī. Vedic literatures explain that that sound vibration which can elevate one from mental concoction is called gāyatrī. The kāma-gāyatrī mantra is composed of 24 1/2 syllables thus:
klīṁ kāma-devāya vidmahe
puṣpa-bāṇāya dhīmahi
tanno 'naṅgaḥ pracodayāt
This kāma-gāyatrī is received from the spiritual master when the disciple is advanced in chanting Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare. In other words, this kāma-gāyatrī mantra and saṁskāra, or reformation of a perfect brāhmaṇa, are offered by the spiritual master when he sees that his disciple is advanced in spiritual knowledge.
(Teachings of Lord Caitanya).

The purport of the word dhīmahi—"I meditate upon"—is that only those who have perfected the chanting of the Gāyatrī mantra can understand the supremely independent Lord. Who is eligible to chant the Gāyatrī mantra? Those who are controlled by the modes of ignorance and passion can never chant the Gāyatrī mantra, what to speak of attaining perfection in chanting it. Only those who possess the qualities of a brāhmaṇa and are situated in the mode of goodness are eligible to chant the Gāyatrī mantra. Gradually, by constant chanting, they come to realize Parabrahman (the Supreme Brahman), or the Absolute Truth. Only then can they perceive the Supreme Personality of Godhead, along with His transcendental name, form, qualities, pastimes, and paraphernalia, as well as the Vaikuṇṭha planets and the Lord of the Vaikuṇṭha planets, Nārāyaṇa.
(Renunciation through Wisdom).

“Then Gāyatrī, mother of the Vedas, having been manifested by the divine sound of Śrī Kṛṣṇa's flute, entered the lotus mouth of Brahmā, the self-born, through his eight earholes. Thus the lotus-born Brahmā received the Gāyatrī mantra, which had sprung from the song of Śrī Kṛṣṇa's flute. In this way he attained twice-born status, having been initiated by the supreme, primal preceptor, Godhead Himself. Enlightened by the recollection of that Gāyatrī, which embodies the three Vedas, Brahmā became acquainted with the expanse of the ocean of truth. Then he worshiped Śrī Kṛṣṇa, the essence of all the Vedas, with a hymn.”

(Sri Caitanya Caritamrta------2:8:138------purport).

The vibration of Kṛṣṇa's flute is the origin of the Vedic hymns. Lord Brahmā, who is seated on a lotus flower, heard the sound vibration of Kṛṣṇa's flute and was thereby initiated by the Gāyatrī mantra.
(Sri Caitanya Caritamrta------2:8:138------purport).

Actually householders and vānaprasthas should bathe two times a day (prātar-madhyāhnayoḥ snānaṁ vānaprastha-gṛhasthayoḥ). A sannyāsī should bathe three times daily, and a brahmacārī may take only one bath a day. Whenever one is not able to bathe in water, he can bathe by chanting the Hare Kṛṣṇa mantra. One also has to perform his sandhyādi-vandana—that is, one has to chant his Gāyatrī mantra three times daily—morning, noon and evening.
(Sri Caitanya Caritamrta------2:24:331------purport).

The sound vibration oṁkāra is the root of Vedic knowledge. Oṁkāra is known as the mahā-vākya, or supreme sound. Whatever meaning is in the supreme sound oṁkāra is further understood in the Gāyatrī mantra. Again, this same meaning is explained in Śrīmad-Bhāgavatam in the four ślokas known as the catuḥ-ślokī, which begin with the words ahaṁ evāsam evāgre.
(Sri Caitanya Caritamrta------2:25:97------purport).

In the very beginning of Śrīmad-Bhāgavatam, the meaning and purpose of the gāyatrī mantra are also described: "I offer my obeisances unto the Supreme Truth." This is the first introductory verse dealing with the Supreme Truth, which is described in Śrīmad-Bhāgavatam as the source of creation, maintenance and destruction for the cosmic manifestation. Obeisances unto the Personality of Godhead, Vāsudeva (oṁ namo bhagavate vāsudevāya), directly indicate Lord Sri Kṛṣṇa, who is the divine son of Vasudeva and Devakī. This fact is more explicitly presented later in Śrīmad-Bhāgavatam.
(Teachings of Lord Caitanya).

Śrīla Vyāsadeva gives the reader a chance to gradually develop in spiritual realization before actually relishing the essence of the pastimes of the Lord. Thus Vyāsadeva purposefully invokes the gāyatrī mantra: dhīmahi. This gāyatrī mantra is especially meant for spiritually advanced people. When one attains success in chantinggāyatrī mantra, he can enter into the transcendental position of the Lord. First, however, one must acquire the brahminical qualities and become perfectly situated in the mode of goodness in order to chant the gāyatrī mantra successfully. From that point one can begin to transcendentally realize the Lord, His name, His fame, His qualities, etc. Śrīmad-Bhāgavatam is a narration dealing with the svarūpa (form) of the Lord, which is manifested by His internal potency.
(Teachings of Lord Caitanya).

No one is the source of Kṛṣṇa, but Kṛṣṇa is the source of everyone. He is the supreme cause of all causes and the resident of Vṛndāvana. He is also very attractive, just like Cupid. One can worship Him by kāma-gāyatrī mantra. In Brahma-saṁhitā the transcendental land of Vṛndāvana is described as being always spiritual. That spiritual land is populated by goddesses of fortune, who are known as gopīs.

(Teachings of Lord Caitanya).

The word klīm added to the gāyatrī mantra is explained in Brahma-saṁhitā as the transcendental seed of love of Godhead, or the seed of the kāma-gāyatrī. The object is Kṛṣṇa, who is the ever green Cupid, and by utterance of klīm mantra Kṛṣṇa is worshiped. It is also stated in the Gopāla-tāpanī Upaniṣad that when Kṛṣṇa is spoken of as Cupid, one should not think of Him as the Cupid of this material world.

(Teachings of Lord Caitanya).

In Sanskrit, there are definite rules that regulate poetry; rhyme and meter are not written whimsically, as in much modern poetry. Amongst the regulated poetry, the Gāyatrī mantra, which is chanted by the duly qualified brāhmaṇas, is the most prominent. The Gāyatrī mantra is mentioned in the Śrīmad-Bhāgavatam. Because the Gāyatrī mantra is especially meant for God realization, it represents the Supreme Lord. This mantra is meant for spiritually advanced people, and when one attains success in chanting it, he can enter into the transcendental position of the Lord. One must first acquire the qualities of the perfectly situated person, the qualities of goodness according to the laws of material nature, in order to chant the Gāyatrī mantra. The Gāyatrī mantra is very important in Vedic civilization and is considered to be the sound incarnation of Brahman. Brahmā is its initiator, and it is passed down from him in disciplic succession.
(Bhagavad-Gita------10:35------purport).

This subject matter is highly spiritual, and only the liberated persons who have gradually attained to the stage of paramahaṁsa can transcendentally relish this rāsa dance. Śrīla Vyāsadeva therefore gives the reader the chance to gradually develop spiritual realization before actually relishing the essence of the pastimes of the Lord. Therefore, he purposely invokes a Gāyatrī mantra, dhīmahi. This Gāyatrī mantra is meant for spiritually advanced people. When one is successful in chanting the Gāyatrī mantra, he can enter into the transcendental position of the Lord. One must therefore acquire brahminical qualities or be perfectly situated in the quality of goodness in order to chant the Gāyatrī mantra successfully and then attain to the stage of transcendentally realizing the Lord, His name, His fame, His qualities and so on.
(Srimad Bhagavatam------1:1:1------purport).

As one has to take bath after using the toilet, so one has to wash himself with water after sexual intercourse, especially when at a forbidden time. Kaśyapa Muni meditated on the impersonal brahmajyoti by chanting the Gāyatrī mantra within his mouth. When a Vedic mantra is chanted within the mouth so that only the chanter can hear, the chanting is called japa. But when such mantras are chanted loudly, it is called kīrtana. The Vedic hymn Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare can be chanted both softly to oneself or loudly; therefore it is called the mahā-mantra, or the great hymn.
(Srimad Bhagavatam------3:14:32------purport).

In our Kṛṣṇa consciousness movement, we accept this principle by rejecting four prohibited items—namely illicit sex life, intoxication, gambling and flesh—eating—and accepting the daily chanting of at least sixteen rounds of the Hare Kṛṣṇa mahā-mantra and daily meditation three times a day by chanting the Gāyatrī mantra. In this way one can keep his brahminical culture and spiritual strength intact. By following these principles of devotional service strictly, chanting twenty-four hours a day the mahā-mantra—Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare—one makes positive progress in spiritual life and ultimately becomes completely fit to see the Supreme Personality of Godhead face to face. Because the ultimate goal of studying or understanding the Vedic knowledge is to find Kṛṣṇa, one who follows the Vedic principles as described above can from the very beginning see all the features of Lord Kṛṣṇa, the Absolute Truth, very distinctly, as one can see one's own face completely reflected in a clear mirror.
(Srimad Bhagavatam------4:21:42------purport).

By chanting the Hare Kṛṣṇa mahā-mantra regularly and following the regulative principles, one becomes qualified to be initiated as a brāhmaṇa, because unless one is a qualified brāhmaṇa he cannot be allowed to worship Lord Viṣṇu. This is called yājñika janma. In our Kṛṣṇa consciousness society, unless one is twice initiated—first by chanting Hare Kṛṣṇa and second by the Gāyatrī mantra—he is not allowed to enter the kitchen or Deity room to execute duties. However, when one is elevated to the platform on which he can worship the Deity, his previous birth does not matter.
(Srimad Bhagavatam------4:31:10------purport).

Sometimes the planets in outer space are called islands. We have experience of various types of islands in the ocean, and similarly the various planets, divided into fourteen lokas, are islands in the ocean of space. As Priyavrata drove his chariot behind the sun, he created seven different types of oceans and planetary systems, which altogether are known as Bhū-maṇḍala, or Bhūloka. In the Gāyatrī mantra, we chant, oṁ bhūr bhuvaḥ svaḥ tat savitur vareṇyam. Above the Bhūloka planetary system is Bhuvarloka, and above that is Svargaloka, the heavenly planetary system. All these planetary systems are controlled by Savitā, the sun-god. By chanting the Gāyatrī mantra just after rising early in the morning, one worships the sun-god.
(Srimad Bhagavatam------5:1:31------purport).

The predominating Deity within the sun is Hiraṇmaya. Lord Nārāyaṇa. He is worshiped by the Gāyatrī mantra: oṁ bhūr bhuvaḥ svaḥ tat savitur vareṇyaṁ bhargo devasya dhīmahi. He is also worshiped by other hymns mentioned in the Ṛg Veda, for instance: dhyeyaḥ sadā savitṛ-maṇḍala-madhya-vartī. Within the sun, Lord Nārāyaṇa is situated, and He has a golden hue.
(Srimad Bhagavatam------5:7:13------purport).

In this verse it is stated that the planetary system known as Bhū-maṇḍala extends to the limits of the sunshine. According to modern science, the sunshine reaches earth from a distance of 93,000,000 miles. If we calculate according to this modern information, 93,000,000 miles can be considered the radius of Bhū-maṇḍala. In the Gāyatrī mantra, we chant oṁ bhūr bhuvaḥ svaḥ. The word bhūr refers to Bhū-maṇḍala. Tat savitur vareṇyam: the sunshine spreads throughout Bhū-maṇḍala. Therefore the sun is worshipable. The stars, which are known as nakṣatra, are not different suns, as modern astronomers suppose. From Bhagavad-gītā (10.21) we understand that the stars are similar to the moon (nakṣatrāṇām ahaṁ śaśī). Like the moon, the stars reflect the sunshine. Apart from our modern distinguished estimations of where the planetary systems are located, we can understand that the sky and its various planets were studied long, long before Śrīmad-Bhāgavatam was compiled.
(Srimad Bhagavatam------5:16:1------purport).

In this regard, Śrīla Viśvanātha Cakravartī Ṭhākura says, sūrya ātmā ātmatvenopāsyaḥ. The actual life and soul of all living entities within this universe is the sun. He is therefore upāsya, worshipable. We worship the sun-god by chanting the Gāyatrī mantra (oṁ bhūr bhuvaḥ svaḥ tat savitur vareṇyaṁ bhargo devasya dhīmahi). Sūrya is the life and soul of this universe, and there are innumerable universes for which a sun-god is the life and soul, just as the Supreme Personality of Godhead is the life and soul of the entire creation. We have information that Vairāja, Hiraṇyagarbha, entered the great, dull, material globe called the sun. This indicates that the theory held by so-called scientists that no one lives there is wrong. Bhagavad-gītā also says that Kṛṣṇa first instructed Bhagavad-gītā to the sun-god (imaṁ vivasvate yogaṁ proktavān aham avyayam (B.G.4:1). Therefore the sun is not vacant.
(Srimad Bhagavatam------5:20:46------purport).

The conditioned souls are engaged in a struggle for existence (manaḥ ṣaṣṭhānīndriyāṇi prakṛti-sthāni karṣati (B.G.15:7). Deliverance from this struggle constitutes the highest benefit, but unless one gets a mantra from the Supreme Personality of Godhead, deliverance is impossible. The beginning mantra is the Gāyatrī mantra. Therefore, after purification, when one is qualified to become a brāhmaṇa (dvija), he is offered the Gāyatrī mantra. Simply by chanting the Gāyatrī mantra, one can be delivered. This mantra, however, is suitable only for the brāhmaṇas and demigods. In Kali-yuga, we are all in a very difficult position, in which we need a suitable mantra that can deliver us from the dangers of this age. Therefore the Supreme Personality of Godhead, in His incarnation as Lord Caitanya, gives us the Hare Kṛṣṇa mantra.
(Srimad Bhagavatam------8:6:15------purport).